Photographing optical lens

Abstract

A photographing optical lens (10, 20, 30, 40). The photographing optical lens comprises seven lenses, the seven lenses successively comprising, from an object side to an image side: a first lens (L1) having negative refractive power, a second lens (L2) having negative refractive power, a third lens (L3) having positive refractive power, a fourth lens (L4) having positive refractive power, a fifth lens (L5) having positive refractive power, a sixth lens (L6) having negative refractive power, and a seventh lens (L7) having positive refractive power; the photographing optical lens (10, 20, 30, 40) satisfies the following relational expressions: -1.30≤f1 / f≤-1.00; 0.02≤d4 / TTL≤0.06; n2≥1.70; and 0.10≤BFL / TTL≤0.30. The photographing optical lens (10, 20, 30, 40) can satisfy the design requirements of large aperture and wide angle.

Description

Camera lens TECHNICAL FIELD

[0001] The present application relates to the field of optical lens, in particular to a camera lens suitable for smart phones, digital cameras and other portable terminal devices, as well as surveillance cameras, PC lenses, vehicle-mounted lenses and other camera devices. BACKGROUND

[0002] In recent years, with the rise of various smart devices, the demand for small-sized camera lenses is increasing, and due to the reduction in the pixel size of photosensitive devices, in addition to the current trend of electronic products being light and thin, the small-sized camera lens with good imaging quality has become the mainstream in the market. In order to obtain better imaging quality, a multi-piece lens structure is often used. With the development of technology and the increasing of user's diversified needs, under the condition of continuously reducing the pixel area of photosensitive devices and continuously improving the imaging quality of the system, a seven-piece lens structure gradually appears in the lens design. There is an urgent need for a wide-angle imaging lens with excellent optical characteristics, small size and fully corrected aberration.

[0003] SUMMARY

[0004] In view of the above problems, the purpose of the present application is to provide a camera lens which has good optical performance while meeting the design requirements of large aperture and wide angle.

[0005] To achieve the above purpose, the technical scheme of the present application provides a camera lens, which comprises seven lenses, and the seven lenses are arranged in order from the object side to the image side as follows: a first lens with negative refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with positive refractive power, a sixth lens with negative refractive power, and a seventh lens with positive refractive power.

[0006] Wherein, the focal length of the camera lens is f, the focal length of the first lens is f1, the axial distance from the image side surface of the second lens to the object side surface of the third lens is d4, the total optical length of the camera lens is TTL, the refractive index of the second lens is nd2, and the axial distance from the image side surface of the seventh lens to the image surface is BFL; and the following relationships are satisfied:

[0007] -1.30≤f1 / f≤-1.00;

[0008] 0.02≤d4 / TTL≤0.06;

[0009] n2≥1.70;

[0010] 0.10≤BFL / TTL≤0.30.

[0011] Preferably, the fifth lens and the sixth lens are cemented together.

[0012] Preferably, the Abbe number of the fifth lens is v5, the Abbe number of the sixth lens is v6, and the following relation is satisfied:

[0013] v5-v6≥35.00.

[0014] Preferably, the central curvature radius of the image side surface of the seventh lens is R14, and the following relation is satisfied:

[0015] -8.00≤R14 / f≤-2.00.

[0016] Preferably, the image side surface of the first lens is concave at the paraxial region;

[0017] the central curvature radius of the object side surface of the first lens is R1, the central curvature radius of the image side surface of the first lens is R2, the on-axis thickness of the first lens is d1, and the following relation is satisfied:

[0018] 0.47≤(R1+R2) / (R1-R2)≤1.81;

[0019] 0.01≤d1 / TTL≤0.14.

[0020] Preferably, the object side surface of the second lens is concave at the paraxial region, and the image side surface of the second lens is convex at the paraxial region;

[0021] the focal length of the second lens is f2, the central curvature radius of the object side surface of the second lens is R3, the central curvature radius of the image side surface of the second lens is R4, the on-axis thickness of the second lens is d3, and the following relation is satisfied:

[0022] -6.56≤f2 / f≤-1.72;

[0023] -2.84≤(R3+R4) / (R3-R4)≤-0.83;

[0024] 0.03≤d3 / TTL≤0.09.

[0025] Preferably, the object side surface of the third lens is convex at the paraxial region, and the image side surface of the third lens is convex at the paraxial region;

[0026] the focal length of the third lens is f3, the central curvature radius of the object side surface of the third lens is R5, the central curvature radius of the image side surface of the third lens is R6, the on-axis thickness of the third lens is d5, and the following relation is satisfied:

[0027] 0.70 < f3 / f < 2.37;

[0028] 0.01 < (R5+R6) / (R5-R6) < 0.23;

[0029] 0.03 < d5 / TTL < 0.16.

[0030] Preferably, the object side surface of the fourth lens is convex at the paraxial region, and the image side surface of the fourth lens is convex at the paraxial region;

[0031] The focal length of the fourth lens is f4, the central radius of curvature of the object side surface of the fourth lens is R7, the central radius of curvature of the image side surface of the fourth lens is R8, the on-axis thickness of the fourth lens is d7, and the following relations are satisfied:

[0032] 1.30 < f4 / f < 4.28;

[0033] 0.20 < (R7+R8) / (R7-R8) < 0.79;

[0034] 0.02 < d7 / TTL < 0.13.

[0035] Preferably, the object side surface of the fifth lens is convex at the paraxial region, and the image side surface of the fifth lens is convex at the paraxial region;

[0036] The focal length of the fifth lens is f5, the central radius of curvature of the object side surface of the fifth lens is R9, the central radius of curvature of the image side surface of the fifth lens is R10, the on-axis thickness of the fifth lens is d9, and the following relations are satisfied:

[0037] 0.49 < f5 / f < 1.92;

[0038] 0.13 < (R9+R10) / (R9-R10) < 0.45;

[0039] 0.07 < d9 / TTL < 0.23.

[0040] Preferably, the object side surface of the sixth lens is concave at the paraxial region, and the image side surface of the sixth lens is concave at the paraxial region;

[0041] The focal length of the sixth lens is f6, the central radius of curvature of the object side surface of the sixth lens is R11, the central radius of curvature of the image side surface of the sixth lens is R12, the on-axis thickness of the sixth lens is d11, and the following relations are satisfied:

[0042] -2.18 < f6 / f < -0.62;

[0043] -1.77 < (R11+R12) / (R11-R12) < -0.51;

[0044] 0.01≤d11 / TTL≤0.08.

[0045] Preferably, the image side surface of the seventh lens is convex at the paraxial region;

[0046] The focal length of the seventh lens is f7, the central curvature radius of the object side surface of the seventh lens is R13, the central curvature radius of the image side surface of the seventh lens is R14, the on-axis thickness of the seventh lens is d13, and the following relationships are satisfied:

[0047] 1.94≤f7 / f≤21.57;

[0048] 0.24≤(R13+R14) / (R13-R14)≤1.97;

[0049] 0.05≤d13 / TTL≤0.28.

[0050] Preferably, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are made of glass.

[0051] The camera optical lens according to the present application has excellent optical characteristics, and has the characteristics of large aperture and wide angle, and is particularly suitable for a WEB camera lens and a vehicle-mounted camera lens composed of a high-pixel CCD, a CMOS or the like. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the following embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0053] Fig. 1 is a structural schematic diagram of a camera optical lens according to a first embodiment of the present application;

[0054] Fig. 2 is an axial aberration schematic diagram of the camera optical lens shown in Fig. 1;

[0055] Fig. 3 is a magnification chromatic aberration schematic diagram of the camera optical lens shown in Fig. 1;

[0056] Fig. 4 is a field curvature and distortion schematic diagram of the camera optical lens shown in Fig. 1;

[0057] Fig. 5 is a structural schematic diagram of a camera optical lens according to a second embodiment of the present application;

[0058] Fig. 6 is an axial aberration schematic diagram of the camera optical lens shown in Fig. 5;

[0059] Fig. 7 is a schematic view of the lateral chromatic aberration of the photographing optical lens shown in Fig. 5;

[0060] Fig. 8 is a schematic view of the field curvature and distortion of the photographing optical lens shown in Fig. 5;

[0061] Fig. 9 is a schematic view of the structure of a photographing optical lens according to a third embodiment of the present application;

[0062] Fig. 10 is a schematic view of the axial aberration of the photographing optical lens shown in Fig. 9;

[0063] Fig. 11 is a schematic view of the lateral chromatic aberration of the photographing optical lens shown in Fig. 9;

[0064] Fig. 12 is a schematic view of the field curvature and distortion of the photographing optical lens shown in Fig. 9;

[0065] Fig. 13 is a schematic view of the structure of a photographing optical lens according to a fourth embodiment of the present application;

[0066] Fig. 14 is a schematic view of the axial aberration of the photographing optical lens shown in Fig. 13;

[0067] Fig. 15 is a schematic view of the lateral chromatic aberration of the photographing optical lens shown in Fig. 13;

[0068] Fig. 16 is a schematic view of the field curvature and distortion of the photographing optical lens shown in Fig. 13;

[0069] Fig. 17 is a schematic view of the structure of a photographing optical lens according to a comparative embodiment of the present application;

[0070] Fig. 18 is a schematic view of the axial aberration of the photographing optical lens shown in Fig. 17;

[0071] Fig. 19 is a schematic view of the lateral chromatic aberration of the photographing optical lens shown in Fig. 17;

[0072] Fig. 20 is a schematic view of the field curvature and distortion of the photographing optical lens shown in Fig. 17. DETAILED DESCRIPTION

[0073] In order to make the objectives, technical solutions, and advantages of the present application clearer, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. However, those skilled in the art can understand that, in the embodiments of the present application, many technical details are presented in order to make the readers better understand the present application. However, the technical solutions claimed by the present application can be implemented even without these technical details and based on various changes and modifications of the following embodiments.

[0074] With reference to the drawings, the technical scheme of the present application provides a kind of camera optical lens 10,20,30,40.The camera optical lens 10,20,30,40 shown in Figure 1,5,9,13, the camera optical lens 10,20,30,40 includes seven lenses in total.Specifically, camera optical lens, from object side to image side in order: first lens L1, second lens L2, aperture S1, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7.Seventh lens L7 and image surface Si can be provided with optical filter (filter) GF and other optical elements.

[0075] First lens L1 is glass material, second lens L2 is glass material, third lens L3 is glass material, fourth lens L4 is glass material, fifth lens L5 is glass material, sixth lens L6 is glass material, seventh lens L7 is glass material.Each lens can also be other materials.

[0076] First lens L1 has negative refractive power, second lens L2 has negative refractive power, third lens L3 has positive refractive power, fourth lens L4 has positive refractive power, fifth lens L5 has positive refractive power, sixth lens L6 has negative refractive power, seventh lens L7 has positive refractive power.In other alternative embodiments, each lens can also have other refractive power.

[0077] The object side and image side of first lens L1, third lens L3, fourth lens L4, fifth lens L5 and sixth lens L6 are spherical surface, and the object side and image side of second lens L2 and seventh lens L7 are aspherical surface.

[0078] The focal length of the camera optical lens is defined as f, the focal length of the first lens L1 is f1, and the following relationship is satisfied:-1.30≤f1 / f≤-1.00, which defines the ratio of the focal length of the first lens L1 and the camera optical lens.By reasonably allocating the focal length of the system, the field curvature of the camera optical lens can be effectively balanced, and the field curvature offset of the central field of view is less than 0.01mm.

[0079] The axial distance from the image side of the second lens L2 to the object side of the third lens L3 is defined as d4, and the total optical length of the camera optical lens is TTL, and the following relationship is satisfied:0.02≤d4 / TTL≤0.06, which defines the ratio of the axial distance between the second lens L2 and the third lens L3 near the diaphragm and the total optical length, which is higher than the lower limit, which is helpful for the smooth transition of light near the diaphragm, and is conducive to improving image quality, and lower than the upper limit is helpful for controlling the total optical length.

[0080] The refractive index of the second lens L2 is n2, and the following relationship is satisfied: n2≥1.70. The front lens is preferably made of a high refractive index material, which is beneficial to reducing the front aperture and improving the imaging quality.

[0081] The axial distance from the image side surface of the seventh lens L7 to the image plane, i.e., the back focal length, is defined as BFL, and the following relationship is satisfied: 0.10≤BFL / TTL≤0.30. On the basis of miniaturization, the back focal length is long, which is beneficial to the assembly of the module, the short optical total length, the compact structure, the reduction of the sensitivity of the lens to MTF, the improvement of the production yield, and the reduction of the production cost.

[0082] Under the condition of satisfying the above several relationships, the imaging optical lens 10, 20, 30, or 40 has good optical performance while meeting the design requirements of large aperture and wide angle. According to the characteristics of the imaging optical lens 10, 20, 30, or 40, the imaging optical lens 10, 20, 30, or 40 is particularly suitable for a WEB imaging lens and a vehicle-mounted lens composed of a high-pixel CCD, CMOS, or other imaging element.

[0083] Based on the above relationships and the functions that can be achieved, the characteristics of each lens are further refined as follows.

[0084] The fifth lens L5 and the sixth lens L6 are glued together. By gluing, the overall volume of the imaging optical lens can be reduced. In addition, by gluing, the two lenses form a whole structure, and the installation of the two lenses can be completed at one time when the optical module is assembled.

[0085] The Abbe number of the fifth lens L5 is defined as v5, and the Abbe number of the sixth lens L6 is defined as v6, and the following relationship is satisfied: v5-v6≥35.00. The difference between the Abbe numbers of the glued fifth lens L5 and the sixth lens L6 is specified. Within this range, the material properties can be effectively distributed, and the chromatic aberration can be effectively corrected, so that the chromatic aberration |LC|≤5μm.

[0086] The central curvature radius of the image side surface of the seventh lens L7 is defined as R14, and the following relationship is satisfied: -8.00≤R14 / f≤-2.00. By specifying the surface shape of the light exit surface, within the relationship range, the degree of deflection of the light passing through the lens can be alleviated, and the aberration can be well reduced.

[0087] The image side surface of the first lens L1 is concave at the near axis, and the image side surface of the first lens L1 can also be provided in other concave or convex distribution.

[0088] The central curvature radius of the object side surface of the first lens is R1, the central curvature radius of the image side surface of the first lens is R2, and the following relationship is satisfied: 0.47≤(R1+R2) / (R1-R2)≤1.81. By reasonably controlling the shape of the first lens L1, the first lens L1 can effectively correct the system spherical aberration. Preferably, 0.75≤(R1+R2) / (R1-R2)≤1.45 is satisfied.

[0089] The on-axis thickness of the first lens L1 is d1, and the following relationship is satisfied: 0.01≤d1 / TTL≤0.14. Within the range of the relationship, the thickness of the lens is beneficially controlled, the light is smooth, and the aberration is effectively controlled. Preferably, 0.01≤d1 / TTL≤0.11 is satisfied.

[0090] The object side surface of the second lens L2 is concave at the paraxial region, and the image side surface is convex at the paraxial region. The object side surface and the image side surface of the second lens L2 can also be provided in other concave and convex distribution conditions.

[0091] The focal length of the second lens L2 is f2, and the following relationship is satisfied: -6.56≤f2 / f≤-1.72. By controlling the optical power of the second lens L2 within a reasonable range, the aberration of the optical system is beneficially corrected. Preferably, -4.10≤f2 / f≤2.15 is satisfied.

[0092] The central curvature radius of the object side surface of the second lens L2 is R3, the central curvature radius of the image side surface of the second lens L2 is R4, and the following relationship is satisfied: -2.84≤(R3+R4) / (R3-R4)≤-0.83. By reasonably controlling the shape of the second lens L2, the second lens L2 can effectively correct the system spherical aberration. Preferably, -1.77≤(R3+R4) / (R3-R4)≤1.04 is satisfied.

[0093] The on-axis thickness of the second lens L2 is d3, and the following relationship is satisfied: 0.03≤d3 / TTL≤0.09. Within the range of the relationship, the thickness of the lens is controlled, the light is smooth, and the aberration is effectively controlled. Preferably, 0.04≤d3 / TTL≤0.07 is satisfied.

[0094] The object side surface of the third lens L3 is convex at the paraxial region, and the image side surface is convex at the paraxial region. The object side surface and the image side surface of the third lens L3 can also be provided in other concave and convex distribution conditions.

[0095] The focal length of the third lens L3 is f3, and the following relationship is satisfied: 0.70≤f3 / f≤2.37. By reasonably distributing the optical power, the system has better imaging quality and lower sensitivity. Preferably, 1.11≤f3 / f≤1.90 is satisfied.

[0096] The central radius of curvature of the object side surface of the third lens L3 is R5, and the central radius of curvature of the image side surface of the third lens L3 is R6, satisfying the following relationship: 0.01≤(R5+R6) / (R5-R6)≤0.23, which defines the shape of the third lens L3. When the relationship is within the range, as the lens develops towards wide-angle, it is beneficial to correct the on-axis chromatic aberration problem. Preferably, 0.02≤(R5+R6) / (R5-R6)≤0.18 is satisfied.

[0097] The on-axis thickness of the third lens L3 is d5, satisfying the following relationship: 0.03≤d5 / TTL≤0.16. Within the range of the relationship, by controlling the thickness of the lens, the light is smooth, thereby effectively controlling the aberration. Preferably, 0.05≤d5 / TTL≤0.13 is satisfied.

[0098] The object side surface of the fourth lens L4 is convex at the paraxial region, and the image side surface is convex at the paraxial region. The object side surface and the image side surface of the fourth lens L4 can also be provided with other concave and convex distribution conditions.

[0099] The focal length of the fourth lens L4 is defined as f4, satisfying the following relationship: 1.30≤f4 / f≤4.28. Through reasonable distribution of optical power, the system has better imaging quality and lower sensitivity. Preferably, 2.08≤f4 / f≤3.43 is satisfied.

[0100] The central radius of curvature of the object side surface of the fourth lens L4 is R7, and the central radius of curvature of the image side surface of the fourth lens L4 is R8, satisfying the following relationship: 0.20≤(R7+R8) / (R7-R8)≤0.79, which defines the shape of the fourth lens L4. Within the range of the relationship, it is helpful for the smooth transition of light, and the image quality is improved. Preferably, 0.31≤(R7+R8) / (R7-R8)≤0.63 is satisfied.

[0101] The on-axis thickness of the fourth lens L4 is d7, satisfying the following relationship: 0.02≤d7 / TTL≤0.13. Within the range of the relationship, by controlling the thickness of the lens, the light is smooth, thereby effectively controlling the aberration. Preferably, 0.03≤d7 / TTL≤0.11 is satisfied.

[0102] The object side surface of the fifth lens L5 is convex at the paraxial region, and the image side surface is convex at the paraxial region. The object side surface and the image side surface of the fifth lens L5 can also be provided with other concave and convex distribution conditions.

[0103] The focal length of the fifth lens L5 is f5, satisfying the following relationship: 0.49≤f5 / f≤1.92. The limitation of the fifth lens L5 can effectively make the light angle of the imaging optical lens smooth, and reduce the tolerance sensitivity. Preferably, 0.79≤f5 / f≤1.54 is satisfied.

[0104] The central radius of curvature of the object side surface of the fifth lens L5 is R9, and the central radius of curvature of the image side surface of the fifth lens L5 is R10, which satisfy the following relation: 0.13≤(R9+R10) / (R9-R10)≤0.45, which defines the shape of the fifth lens L5, and within the range of the relation, it is beneficial to correct the astigmatism and distortion of the photographing optical lens. Preferably, 0.21≤(R9+R10) / (R9-R10)≤0.36 is satisfied.

[0105] The on-axis thickness of the fifth lens L5 is d9, which satisfies the following relation: 0.07≤d9 / TTL≤0.23, and within the range of the relation, by controlling the thickness of the lens, the light is smooth, thereby effectively controlling the aberration. Preferably, 0.12≤d9 / TTL≤0.19 is satisfied.

[0106] The object side surface of the sixth lens L6 is concave at the paraxial region, and the image side surface of the sixth lens L6 is concave at the paraxial region. The object side surface and the image side surface of the sixth lens L6 can also be provided with other concave and convex distribution.

[0107] The focal length of the sixth lens L6 is f6, which satisfies the following relation: -2.18≤f6 / f≤-0.62, and by reasonably distributing the optical power, the system has better imaging quality and lower sensitivity. Preferably, -1.36≤f6 / f≤-0.77 is satisfied.

[0108] The central radius of curvature of the object side surface of the sixth lens L6 is R11, and the central radius of curvature of the image side surface of the sixth lens L6 is R12, which satisfy the following relation: -1.77≤(R11+R12) / (R11-R12)≤-0.51, which defines the shape of the sixth lens L6, and within the range of the relation, with the development of wide-angle, it is beneficial to correct the aberration of the off-axis angle and other problems. Preferably, -1.10≤(R11+R12) / (R11-R12)≤-0.64 is satisfied.

[0109] The on-axis thickness of the sixth lens L6 is d11, which satisfies the following relation: 0.01≤d11 / TTL≤0.08, and within the range of the relation, by controlling the thickness of the lens, the light is smooth, thereby effectively controlling the aberration. Preferably, 0.02≤d11 / TTL≤0.06 is satisfied.

[0110] The image side surface of the seventh lens L7 is convex at the paraxial region. The image side surface of the seventh lens L7 can also be provided with other concave and convex distribution.

[0111] The focal length of the seventh lens L7 is defined as f7, and it satisfies the following relation: 1.94≤f7 / f≤21.57, which defines the ratio of the last lens and the total focal length of the photographing optical lens, and by reasonably distributing the optical power of the system, it is helpful to collect light and ensure the light quantity. Preferably, 3.10≤f7 / f≤17.26 is satisfied.

[0112] The central radius of curvature of the object side surface of the seventh lens L7 is R13, and the following relationship is satisfied: 0.24≤(R13+R14) / (R13-R14)≤1.97, which defines the shape of the seventh lens L7, and when the relationship is within the range, with the development of wide-angle, it is beneficial to correct the aberration of the off-axis angle and other problems. Preferably, 0.39≤(R13+R14) / (R13-R14)≤1.58 is satisfied.

[0113] The on-axis thickness of the seventh lens L7 is d13, and the following relationship is satisfied: 0.05≤d13 / TTL≤0.28, and within the range of the relationship, by controlling the thickness of the lens, the light is smooth, thereby effectively controlling the aberration. Preferably, 0.08≤d13 / TTL≤0.23 is satisfied.

[0114] In addition, the field of view FOV of the imaging optical lens is greater than or equal to 130.00°, thereby realizing wide-angle.

[0115] The aperture value FNO of the imaging optical lens is less than or equal to 2.05, thereby realizing a large aperture, and the imaging performance of the imaging optical lens is good.

[0116] The imaging optical lens of the present application will be described below with examples. The symbols described in each example are as follows. The units of focal length, on-axis distance, central radius of curvature, and on-axis thickness are mm.

[0117] TTL: total optical length (on-axis distance from the object side surface of the first lens L1 to the image surface Si), unit: mm;

[0118] Aperture value FNO: refers to the ratio of the effective focal length of the imaging optical lens to the entrance pupil diameter.

[0119] Next, the technical solutions of the present application will be specifically described in four embodiments, and a comparative embodiment is provided as a reference description. When the range exceeds the above relationship, the technical effects of the present application cannot be achieved.

[0120] (First embodiment)

[0121] Table 1 and Table 2 show the design data of the imaging optical lens 10 of the first embodiment of the present application.

[0122] Among them, the object side surface of the first lens L1 is convex at the near axis, and the object side surface of the seventh lens L7 is concave at the near axis.

[0123]

Table 1

[0124] Among them, the meanings of the symbols are as follows.

[0125] S1: stop;

[0126] R: radius of curvature at the center of the optical surface;

[0127] R1: central radius of curvature of the object side surface of the first lens L1;

[0128] R2: central radius of curvature of the image side surface of the first lens L1;

[0129] R3: central radius of curvature of the object side surface of the second lens L2;

[0130] R4: central radius of curvature of the image side surface of the second lens L2;

[0131] R5: central radius of curvature of the object side surface of the third lens L3;

[0132] R6: central radius of curvature of the image side surface of the third lens L3;

[0133] R7: central radius of curvature of the object side surface of the fourth lens L4;

[0134] R8: central radius of curvature of the image side surface of the fourth lens L4;

[0135] R9: central radius of curvature of the object side surface of the fifth lens L5;

[0136] R10: central radius of curvature of the image side surface of the fifth lens L5;

[0137] R11: central radius of curvature of the object side surface of the sixth lens L6;

[0138] R12: central radius of curvature of the image side surface of the sixth lens L6;

[0139] R13: central radius of curvature of the object side surface of the seventh lens L7;

[0140] R14: central radius of curvature of the image side surface of the seventh lens L7;

[0141] R15: central radius of curvature of the object side surface of the optical filter GF;

[0142] R16: central radius of curvature of the image side surface of the optical filter GF;

[0143] d: on-axis thickness of a lens, on-axis distance between lenses;

[0144] d0: on-axis distance from the stop S1 to the object side surface of the first lens L1;

[0145] d1: on-axis thickness of the first lens L1;

[0146] d2: an on-axis distance from an image-side surface of the first lens L1 to an object-side surface of the second lens L2;

[0147] d3: an on-axis thickness of the second lens L2;

[0148] d4: an on-axis distance from an image-side surface of the second lens L2 to an object-side surface of the third lens L3;

[0149] d5: an on-axis thickness of the third lens L3;

[0150] d6: an on-axis distance from an image-side surface of the third lens L3 to an object-side surface of the fourth lens L4;

[0151] d7: an on-axis thickness of the fourth lens L4;

[0152] d8: an on-axis distance from an image-side surface of the fourth lens L4 to an object-side surface of the fifth lens L5;

[0153] d9: an on-axis thickness of the fifth lens L5;

[0154] d10: an on-axis distance from an image-side surface of the fifth lens L5 to an object-side surface of the sixth lens L6;

[0155] d11: an on-axis thickness of the sixth lens L6;

[0156] d12: an on-axis distance from an image-side surface of the sixth lens L6 to an object-side surface of the seventh lens L7;

[0157] d13: an on-axis thickness of the seventh lens L7;

[0158] d14: an on-axis distance from an image-side surface of the seventh lens L7 to an object-side surface of the optical filter GF;

[0159] d15: an on-axis thickness of the optical filter GF;

[0160] d16: an on-axis distance from an image-side surface of the optical filter GF to an image plane Si;

[0161] nd: a refractive index of the d-line (the d-line is green light having a wavelength of 555 nm);

[0162] nd1: a refractive index of the d-line of the first lens L1;

[0163] nd2: a refractive index of the d-line of the second lens L2;

[0164] nd3: a refractive index of the d-line of the third lens L3;

[0165] nd4: a refractive index of the d-line of the fourth lens L4;

[0166] nd5: a refractive index of the d-line of the fifth lens L5;

[0167] nd6: Abbe number of d-line of the sixth lens L6;

[0168] nd7: Abbe number of d-line of the seventh lens L7;

[0169] ndg: Abbe number of d-line of the optical filter GF;

[0170] vd: Abbe number;

[0171] v1: Abbe number of the first lens L1;

[0172] v2: Abbe number of the second lens L2;

[0173] v3: Abbe number of the third lens L3;

[0174] v4: Abbe number of the fourth lens L4;

[0175] v5: Abbe number of the fifth lens L5;

[0176] v6: Abbe number of the sixth lens L6;

[0177] v7: Abbe number of the seventh lens L7;

[0178] vg: Abbe number of the optical filter GF.

[0179] Table 2 shows aspherical surface data of the second lens L2 and the seventh lens L7 in the imaging optical lens 10 of the first embodiment of the present application.

[0180]

Table 2

[0181] For convenience, the aspherical surface of each lens surface uses the aspherical surface shown in the following formula (1). However, the present application is not limited to the aspherical polynomial form represented by the formula (1). 2 z = (cr 2 r 2 ) 1 / 2}m + A4r 4 + A6r 6 + A8r 8 + A10r 10 + A12r 12 + A14r 14 + A16r 16 + A18r 18 + A20r 20 + A22r 22 (1)

[0182] where k is a conic constant, A4, A6, A8, A10, A12, A14, A16, A18, A20, A22 are aspherical coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance of a point on the aspherical curve from the optical axis, and z is the aspherical depth (the perpendicular distance between a point on the aspherical curve at a distance r from the optical axis and a tangent plane at the vertex of the aspherical surface).

[0183] Figures 2 and 3 respectively show axial aberration and lateral chromatic aberration diagrams of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm after passing through the camera optical lens 10 of the first embodiment. Figure 4 shows field curvature and distortion diagrams of light with a wavelength of 555 nm after passing through the camera optical lens 10 of the first embodiment. The field curvature S of Figure 4 is the sagittal field curvature, and the field curvature T is the tangential field curvature.

[0184] In the present embodiment, the entrance pupil diameter ENPD of the camera optical lens 10 is 2.11 mm, the full field image height IH is 4.450 mm, and the field of view FOV in the diagonal direction is 139.60°. The camera optical lens 10 satisfies the design requirements of large aperture and wide angle, and the on-axis and off-axis chromatic aberrations are sufficiently corrected, and the camera optical lens 10 has excellent optical characteristics.

[0185] (Second Embodiment)

[0186] The symbol meanings of the second embodiment are the same as those of the first embodiment.

[0187] Figure 5 shows the camera optical lens 20 of the second embodiment of the present application.

[0188] The object side surface of the first lens L1 is concave at the paraxial region, and the object side surface of the seventh lens L7 is concave at the paraxial region.

[0189] Tables 3 and 4 show the design data of the camera optical lens 20 of the second embodiment of the present application.

[0190]

Table 3

[0191] Table 4 shows the aspherical data of the second lens L2 and the seventh lens L7 of the camera optical lens 20 of the second embodiment of the present application.

[0192]

Table 4

[0193] Fig. 6 and Fig. 7 respectively show the axial aberration and the lateral chromatic aberration of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm and 470 nm after passing through the photographing optical lens 20 of the second embodiment. Fig. 8 shows the field curvature and the distortion of light with a wavelength of 555 nm after passing through the photographing optical lens 20 of the second embodiment. The field curvature S of Fig. 8 is the sagittal field curvature, and the field curvature T is the tangential field curvature.

[0194] In the embodiment, the entrance pupil diameter ENPD of the photographing optical lens 20 is 2.191 mm, the full field image height IH is 4.399 mm, and the diagonal direction field of view FOV is 137.62°. The photographing optical lens 20 meets the design requirements of large aperture and wide angle, and the on-axis and off-axis chromatic aberrations are fully corrected, and the photographing optical lens 20 has excellent optical characteristics.

[0195] (Third Embodiment)

[0196] The symbol meanings of the third embodiment are the same as those of the first embodiment.

[0197] Fig. 9 shows the photographing optical lens 30 of the third embodiment of the present application.

[0198] The object side surface of the first lens L1 is convex at the paraxial region, and the object side surface of the seventh lens L7 is concave at the paraxial region.

[0199] Table 5 and Table 6 show the design data of the photographing optical lens 30 of the third embodiment of the present application.

[0200]

Table 5

[0201] Table 6 shows the aspheric surface data of the second lens L2 and the seventh lens L7 in the photographing optical lens 30 of the third embodiment of the present application.

[0202]

Table 6

[0203] Fig. 10 and Fig. 11 respectively show the axial aberration and the lateral chromatic aberration of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm and 470 nm after passing through the photographing optical lens 30 of the third embodiment. Fig. 12 shows the field curvature and the distortion of light with a wavelength of 555 nm after passing through the photographing optical lens 30 of the third embodiment. The field curvature S of Fig. 12 is the sagittal field curvature, and the field curvature T is the tangential field curvature.

[0204] In the embodiment, the entrance pupil diameter ENPD of the photographing optical lens 30 is 2.128 mm, the full field of view image height IH is 4.591 mm, the diagonal direction field of view angle FOV is 136.73°, the photographing optical lens 30 meets the design requirements of large aperture and wide angle, the on-axis and off-axis chromatic aberration is fully corrected, and the photographing optical lens 30 has excellent optical characteristics.

[0205] (Fourth Embodiment)

[0206] The symbol meanings of the fourth embodiment are the same as those of the first embodiment.

[0207] FIG. 13 shows a photographing optical lens 40 of the fourth embodiment of the present application.

[0208] The object side surface of the first lens L1 is convex at the paraxial region, and the object side surface of the seventh lens L7 is convex at the paraxial region.

[0209] Tables 7 and 8 show the design data of the photographing optical lens 40 of the fourth embodiment of the present application.

[0210] [Table 7]

[0211] Table 8 shows the aspheric surface data of the second lens L2 and the seventh lens L7 in the photographing optical lens 40 of the fourth embodiment of the present application.

[0212] [Table 8]

[0213] FIGS. 14 and 15 respectively show the axial aberration and the magnification chromatic aberration diagrams of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm passing through the photographing optical lens 40 of the fourth embodiment. FIG. 16 shows the field curvature and distortion diagrams of light with a wavelength of 555 nm passing through the photographing optical lens 40 of the fourth embodiment. The field curvature S of FIG. 16 is the sagittal direction field curvature, and T is the tangential direction field curvature.

[0214] In the embodiment, the entrance pupil diameter ENPD of the photographing optical lens 40 is 1.93 mm, the full field of view image height IH is 4.468 mm, the diagonal direction field of view angle FOV is 130.84°, the photographing optical lens 40 meets the design requirements of large aperture and wide angle, the on-axis and off-axis chromatic aberration is fully corrected, and the photographing optical lens 40 has excellent optical characteristics.

[0215] The subsequently appearing Table 11 shows the values corresponding to the parameters defined in the various numerical values and relationships in the first, second, third, and fourth embodiments.

[0216] (Comparative Embodiment)

[0217] The symbol meanings of the comparative embodiment are the same as those of the first embodiment.

[0218] FIG. 17 shows a camera optical lens 50 of a comparative embodiment of the present application.

[0219] The object side surface of the first lens L1 is concave at the paraxial region, and the object side surface of the seventh lens L7 is concave at the paraxial region.

[0220] Tables 9 and 10 show the design data of the camera optical lens 50 of the comparative embodiment of the present application.

[0221]

Table 9

[0222] Table 10 shows the aspheric surface data of the second lens L2 and the seventh lens L7 of the camera optical lens 50 of the comparative embodiment of the present application.

[0223]

Table 10

[0224] FIGS. 18 and 19 show the axial aberration and the lateral chromatic aberration of the light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm and 470 nm, respectively, after passing through the camera optical lens 50 of the comparative embodiment. FIG. 20 shows the field curvature and the distortion of the light with a wavelength of 555 nm after passing through the camera optical lens 50 of the comparative embodiment. The field curvature S of FIG. 20 is the sagittal field curvature, and the field curvature T is the tangential field curvature.

[0225] Table 11 below lists the values corresponding to each of the above relationships in the comparative embodiment. Obviously, the camera optical lens 60 of the comparative embodiment does not satisfy the above relationship -1.3≤f1 / f≤-1, and has poor imaging performance.

[0226] In the present embodiment, the entrance pupil diameter ENPD of the camera optical lens 50 is 2.405 mm, the full field image height IH is 4.400 mm, and the field of view FOV in the diagonal direction is 129.20°. The camera optical lens 50 does not satisfy the design requirements of large aperture and wide angle, and the on-axis and off-axis chromatic aberrations are fully corrected, and has excellent optical characteristics.

[0227]

Table 11

[0228] It is understood by those skilled in the art that the above embodiments are specific embodiments for implementing the present application, and in actual applications, various changes can be made in form and details without departing from the spirit and scope of the present application.

Claims

1. A camera optical lens characterized in that, The camera optical lens comprises seven lenses in sequence from the object side to the image side: a first lens with negative refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with positive refractive power, a sixth lens with negative refractive power, and a seventh lens with positive refractive power. Wherein, the focal length of the camera optical lens is f, the focal length of the first lens is f1, the axial distance from the image side of the second lens to the object side of the third lens is d4, the total optical length of the camera optical lens is TTL, the refractive index of the second lens is nd2, the axial distance from the image side of the seventh lens to the image plane is BFL; and the following relationships are satisfied: -1.30≤f1 / f≤-1.00; 0.02≤d4 / TTL≤0.06; n2≥1.70； 0.10≤BFL / TTL≤0.

30.

2. The camera optical lens according to claim 1, wherein, The fifth lens and the sixth lens are cemented.

3. The camera optical lens according to claim 2, characterized in that, The Abbe number of the fifth lens is v5, the Abbe number of the sixth lens is v6, and the following relationship is satisfied: v5-v6≥35.

00.

4. The camera optical lens according to claim 1, characterized in that, The central curvature radius of the image side of the seventh lens is R14, and the following relationship is satisfied: -8.00≤R14 / f≤-2.

00.

5. The camera optical lens according to claim 1, characterized in that, The image side of the first lens is concave at the near axis; The central curvature radius of the object side of the first lens is R1, the central curvature radius of the image side of the first lens is R2, the axial thickness of the first lens is d1, and the following relationships are satisfied: 0.47≤(R1+R2) / (R1-R2)≤1.81; 0.01≤d1 / TTL≤0.

14.

6. The camera optical lens according to claim 1, wherein, The object side of the second lens is concave at the near axis, and the image side of the second lens is convex at the near axis; The focal length of the second lens is f2, the central curvature radius of the object side of the second lens is R3, the central curvature radius of the image side of the second lens is R4, the axial thickness of the second lens is d3, and the following relationships are satisfied: -6.56≤f2 / f≤-1.72; -2.84≤(R3+R4) / (R3-R4)≤-0.83; 0.03≤d3 / TTL≤0.

09.

7. The camera optical lens according to claim 1, wherein, The object side of the third lens is convex at the near axis, and the image side of the third lens is convex at the near axis; The focal length of the third lens is f3, the central curvature radius of the object side of the third lens is R5, the central curvature radius of the image side of the third lens is R6, the axial thickness of the third lens is d5, and the following relationships are satisfied: 0.70≤f3 / f≤2.37; 0.01≤(R5+R6) / (R5-R6)≤0.23; 0.03≤d5 / TTL≤0.

16.

8. The camera optical lens according to claim 1, characterized in that, The object side of the fourth lens is convex at the near axis, and the image side of the fourth lens is convex at the near axis; The focal length of the fourth lens is f4, the central curvature radius of the object side of the fourth lens is R7, the central curvature radius of the image side of the fourth lens is R8, the axial thickness of the fourth lens is d7, and the following relationships are satisfied: 1.30 ≤ f4 / f ≤ 4.28; 0.20 ≤ (R7+R8) / (R7-R8) ≤ 0.79; 0.02 ≤ d7 / TTL ≤ 0.

13.

9. The camera optical lens according to claim 1, characterized in that, the object side surface of the fifth lens is convex at the paraxial region, and the image side surface of the fifth lens is convex at the paraxial region; the focal length of the fifth lens is f5, the central radius of curvature of the object side surface of the fifth lens is R9, the central radius of curvature of the image side surface of the fifth lens is R10, the on-axis thickness of the fifth lens is d9, and the following relations are satisfied: 0.49 ≤ f5 / f ≤ 1.92; 0.13 ≤ (R9+R10) / (R9-R10) ≤ 0.45; 0.07 ≤ d9 / TTL ≤ 0.

23.

10. The camera optical lens according to claim 1, characterized in that, the object side surface of the sixth lens is concave at the paraxial region, and the image side surface of the sixth lens is concave at the paraxial region; the focal length of the sixth lens is f6, the central radius of curvature of the object side surface of the sixth lens is R11, the central radius of curvature of the image side surface of the sixth lens is R12, the on-axis thickness of the sixth lens is d11, and the following relations are satisfied: -2.18 ≤ f6 / f ≤ -0.62; -1.77 ≤ (R11+R12) / (R11-R12) ≤ -0.51; 0.01 ≤ d11 / TTL ≤ 0.

08.

11. The camera optical lens according to claim 1, characterized in that, the image side surface of the seventh lens is convex at the paraxial region; the focal length of the seventh lens is f7, the central radius of curvature of the object side surface of the seventh lens is R13, the central radius of curvature of the image side surface of the seventh lens is R14, the on-axis thickness of the seventh lens is d13, and the following relations are satisfied: 1.94 ≤ f7 / f ≤ 21.57; 0.24 ≤ (R13+R14) / (R13-R14) ≤ 1.97; 0.05 ≤ d13 / TTL ≤ 0.

28.

12. The camera optical lens according to claim 1, characterized in that, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are made of glass.

Images